America will vote on Tuesday and much is at stake as the country passes judgement on Trump’s presidency which completes two years. Here are all the questions you wanted to ask including the big one – can Donald Trump be impeached if Democrats win the Senate and House?

What are midterm elections?

Midterm elections take place halfway through a president’s term and are considered a referendum of his administration.

What’s up for grabs?

All 435 seats in the US House of Representatives

One-third (35) seats of the US Senate

City mayorships and other local official posts

Over 150 ballot measures

Why it matters?

The US has two chambers of Congress which consist of the Senate and the House of Representatives, which is legislative branch of the federal government and are responsible for making laws.

Republicans currently have a majority in both chambers.

51 more seats are needed to control the Senate while 218 seats will secure a majority in the House

To take control of the Senate, Dems need to hold on their current seats and need to take two further seats. Tow in a majority, the need a net gain of 23 seats.

Republicans have 26 of the 36 governors’ seats up for grabs, and if Dems do well there, it will allow them to upset Trump’s applecart.

With a senate majority, Dems can block cabinet and supreme court appointments. With a majority they can hamper Trump administration’s ability to implement programs and can even begin impeachment proceedings for which they need a two-thirds majority in the Senate.

How impeachment works

The process of impeachment starts from the House of Representatives and needs a simple majority to pass. The trial on the other hand is held by the Senate where a 2/3^rd vote is needed for removal, a milestone that has never been reached in America’s history.

Only two Presidents have found themselves impeached, but neither were removed from office. A third - Richard Nixon - quit when the impeachment process started.

Bill Clinton found himself impeached on grounds of perjury, when he lied about the nature of his affair with Monica Lewinsky. The House voted 228 to 206 in favour of impeaching Clinton and 221 to 212 on the second. However, when it reached the senate, it failed to get close to 2/3^rd of the majority required.

The second was Andrew Johnson in 1865. A third Nixon, quit, while impeachment proceedings started against him. However, history bears witness to the fact that no POTUS has ever been removed from office so far due to the impeachment process. At best, they can simply start the impeachment process in the House of Representatives.

Turbulent election season awaits

A turbulent election season that tested President Donald Trump's slash-and-burn political style against the strength of the Democratic resistance comes to a close as Americans cast ballots in the first national election of the Trump era. 

With voters going to the polls Tuesday, nothing is certain. 

Anxious Republicans privately expressed confidence in their narrow Senate majority but feared the House was slipping away. Trump, the GOP's chief messenger, warned that significant Democratic victories would trigger devastating consequences.

"If the radical Democrats take power they will take a wrecking ball to our economy and our future," Trump declared in Cleveland, using the same heated rhetoric that has defined much of his presidency. 

He added: "The Democrat agenda is a socialist nightmare." Democrats, whose very relevance in the Trump era depended on winning at least one chamber of Congress, were laser-focused on health care as they predicted victories that would break up the GOP's monopoly in Washington and state governments.

"They've had two years to find out what it's like to have an unhinged person in the White House," said Washington Gov. Jay Inslee, who leads the Democratic Governors Association. "It's an awakening of the Democratic Party." Democrats could derail Trump's legislative agenda for the next two years should they win control of the House or the Senate. Perhaps more important, they would claim subpoena power to investigate Trump's personal and professional shortcomings.

Some Democrats have already vowed to force the release of his tax returns. Others have pledged to pursue impeachment, although removal from office is unlikely so long as the GOP controls the Senate or even maintains a healthy minority.

Democrats' fate depends upon a delicate coalition of infrequent voters particularly young people and minorities who traditionally shun midterm elections.

If ever there was an off-year election for younger voters to break tradition, this is it. Young voters promised to vote in record numbers as they waged mass protests in the wake of the February mass shooting at a Parkland, Florida, high school that left 17 students and staff dead.

Democrats are drawing strength from women and college-educated voters in general, who swung decidedly against Trump since his election. Polling suggests the Republican coalition is increasingly older, whiter, more male and less likely to have a college degree.

Democrats boast record diversity on the ballot.

Three states could elect their first African-American governors, while several others are running LGBT candidates and Muslims. A record number of women are also running for Senate, House, governorships and state legislative seats.

"The vast majority of women voters are angry, frustrated and they are really done with seeing where the Republican Party is taking them, particularly as it related to heath care and civility," said Stephanie Schriock, who leads EMILY's List, a group that help elect Democratic women. 

"You're going to see the largest gender gap we've ever seen." The political realignment, defined by race, gender and education, could re-shape U.S. politics for a generation. The demographic shifts also reflect each party's closing argument.

While the economy continues to thrive, Trump has spent much of the campaign's final days railing against a caravan of Latin American immigrants seeking asylum at the U.S. border. He dispatched more than 5,000 troops to the region, suggesting soldiers would use lethal force against migrants who throw rocks, before later reversing himself.

Republicans have privately encouraged the president to back off, to no avail.

Democrats, meanwhile, have beat their drum on health care.

"Health care is on the ballot," former President Barack Obama told Democratic volunteers in Virginia. "Health care for millions of people. You vote, you might save a life." Tuesday's results will be colored by the dramatically different landscapes in the fight for the House and Senate.

Most top House races are set in America's suburbs where more educated and affluent voters in both parties have soured on Trump's presidency, despite the strength of the national economy.

Democrats were buoyed by a wave of Republican retirements and an overwhelming fundraising advantage.

They need to pick up two dozen seats to claim the House majority.

Democrats face a far more difficult challenge in the Senate, where they are almost exclusively on defense in rural states where Trump remains popular. Democratic Senate incumbents are up for re-election, for example, in North Dakota, West Virginia, and Montana states Trump carried by 30 percentage points on average two years ago.

Democrats need to win two seats to claim the Senate majority.

Given Trump's stunning victory in 2016, few were confident in their predictions.

"I feel less comfortable making a prediction today than I have in two decades," Republican pollster Frank Luntz said.