The first event that will help decide the candidates for US president is to take place with Monday’s Iowa caucuses.
Democratic and Republican voters will choose their preferred nominees for the White House race.
While victory in Iowa doesn’t guarantee anyone the nomination, it can help give them crucial momentum.
The path appears clear for Donald Trump to be the Republican nominee, but there are still 11 people running for the Democratic nomination.
Many have spent the past few weeks vigorously campaigning in the Midwest state, which is always the first to vote. The primaries contest goes on until early June, and moves on to New Hampshire next Tuesday.
Polls suggest that Bernie Sanders has risen to be the favourite in together with former vice-president Joe Biden. Some of the other big names including Elizabeth Warren, Amy Klobuchar and Pete Buttigieg will be hoping Mr Sanders doesn’t have it all his own way in Iowa.
There are also Republican caucuses on Monday, and two people are running against Mr Trump, but the president’s popularity within his own party is such that his nomination is all but a formality.