The US federal election results are starting to come in, with the world watching to see if Republican Donald Trump or Democrat Kamala Harris will be America's next president. 

But while there are 50 states in the country, there are seven states everyone cares about. 

Here's a quick guide to get yourself up to speed. 

What are the seven key swing states?

• Arizona
• Georgia 
• Michigan
• Nevada
• North Carolina
• Pennsylvania 
• Wisconsin 

What are the results of the swing states so far?

What does 'swing state' mean?

It's a state where there's no overwhelming preference for Republicans or Democrats. 

There are some states that are usually always won by the same party — called safe seats. 

A Republican candidate has won the vote in Texas in every presidential election since 1980. 

On the flipside, a Democratic candidate has won the vote in California in every presidential election since 1992. 

But voters in swing states are less predictable.

You might also hear swing states being described as "battleground states" or "purple states".

Why do these swing states matter so much?

Because a candidate can't win the election without winning at least some swing states. 

In the US, a president is decided based on how many electoral college votes a candidate gets. 

There are 538 votes up for grabs throughout the entire country. 

And these votes are cast by the states. 

How many electoral college votes does each state get?

The 538 electoral college votes aren't divided up equally between each state — some get more than others. 

For example, Florida has 30 votes while Alaska only has three. 

Another rule in the US election system is that a state can only give its electoral college votes to one candidate (except for Nebraska and Maine, which have different rules).

So Florida couldn't give 18 votes to one candidate and 12 to another — it has to give all 30 of its votes to the candidate who the majority of voters in that state picked for president. 

This rule is why some states are more important to win than others. 

How many electoral college votes do the swing states have?

All up, there are 93 electoral college votes up for grabs in the seven key swing states. 

Here's a breakdown of how many electoral college votes each of those states get:

• Arizona: 11 
• Georgia: 16 
• Michigan: 15
• Nevada: 6
• North Carolina: 16
• Pennsylvania: 19
• Wisconsin: 10

When will we know the swing state results?

• Arizona: Counting could take days
• Georgia: Results are expected Wednesday afternoon
• Michigan: Counting is expected to stretch past Wednesday afternoon
• Nevada: Counting could take days
• North Carolina: Results are expected Wednesday afternoon
• Pennsylvania: Counting is expected to stretch past Wednesday afternoon
• Wisconsin: Counting is expected to stretch past Wednesday afternoon

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