States in the United States have different numbers of electors according to their population, and the final result of voting will produce a new president of the United States; Under this system, Ohio and other regions have a large population and many electoral votes, which naturally become the key continent for the general election.

In the United States, the so-called swing States refer to those States that can easily predict the election results without the overwhelming support of a single candidate or political party. On the contrary, Anjou has long supported specific political parties, and the results of each election are similar.

The electoral college system is adopted in American elections, and the election results are calculated by the electoral votes of each state. Except Maine and Nebraska, all other states adopt winner-take-all system, that is, all the winning candidates take the electoral votes of the state.

Therefore, in the swing state, because both sides have the possibility of winning, they become the target of candidates' competition. Among them, some states have great influence on the general election because of their large proportion of electoral votes, and are also called key states.

Traditionally, Ohio, Pennsylvania, Florida, Wisconsin, Michigan, Virginia and North Carolina are all famous swing states.

In terms of electoral votes, Florida (29), Pennsylvania (20), Ohio (18), Michigan (16) and North Carolina (15) are the top five swing states with the most electoral votes. Therefore, Florida, Pennsylvania and Ohio are also called key states.

In addition, the American election will also use the wind vane state to describe the specific swing state. The so-called weathervane state means that when the candidate wins the swing state, the candidate will have a better chance to win the whole election. The more historical statistics show that both win at the same time, the more the state can become a weather vane.

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The vice president of the United States is not directly elected by the American people, but is elected by the presidential candidates of the Democratic Party and the Republican Party and elected by the national congresses of the two parties. When a presidential candidate chooses a vice presidential candidate, he should first consider his political qualifications and conditions, but mainly depends on which part of the political party he represents, in order to achieve a balance and win the support of the largest number of voters as much as possible.

The electoral college system is the product of the combination of American * * * system, federalism and the principle of separation of powers and checks and balances, and it is also the result of compromise and coordination of various interests, so it must have its own insurmountable defects and drawbacks. The United States has been calling for the reform of the electoral college system, but due to various factors, the reform has never been carried out.