Mexico’s political structure differs from that of the United States because (1 point) Responses there exists three branches of government. there exists three branches of government. the vice president does not serve under the president. the vice president does not serve under the president. there exists a multi-party electoral system. there exists a multi-party electoral system. the president heads the government.

All of the given responses are correct and explain the differences between the political structures of Mexico and the United States:

1. Mexico's political structure also consists of three branches of government: the executive, legislative, and judicial branches, just like the United States. So both statements about the three branches are correct.
2. In Mexico, the vice president does not serve under the president. Instead, Mexico has a system where the president appoints a Secretary of the Interior, who acts as the de facto vice president but holds a different official title and role.
3. Mexico does have a multi-party electoral system, unlike the United States which mainly operates with two major political parties, the Democrats and the Republicans.
4. In Mexico, the president serves as both the head of state and head of government. This is in contrast to the United States, where the president serves as the head of state and the separate position of the head of government is held by the prime minister or a similar role in other countries.

Mexico’s political structure differs from that of the United States because:

1. Mexico has a multi-party electoral system: Unlike the United States, which mainly operates under a two-party system (Republicans and Democrats), Mexico has a more diverse political landscape with multiple political parties.
2. The vice president does not serve under the president: In the United States, the vice president serves as the second-in-command to the president. However, in Mexico, the vice president does not hold a position directly below the president. Instead, Mexico has a different executive position called the Secretary of the Interior.
3. The president heads the government: In Mexico, the president not only serves as the head of state but also the head of government. This means that the president has both symbolic and executive powers. In the United States, on the other hand, the roles of head of state (symbolic) and head of government (executive) are separate, with the president serving as the head of government and the vice president or other officials representing the head of state.

The correct answer is: there exists a multi-party electoral system.

To understand the political structure of Mexico and the United States, we can analyze the options provided.

Option 1: "There exists three branches of government" - This statement is incorrect, as both Mexico and the United States have three branches of government: the executive, legislative, and judicial branches.

Option 2: "The vice president does not serve under the president" - This statement is also incorrect. In both Mexico and the United States, the vice president serves under the president and holds a position of authority and responsibility.

Option 3: "There exists a multi-party electoral system" - This statement is correct. Mexico has a multi-party electoral system, which means that there are multiple political parties participating in elections, and voters have the option to choose between different parties and candidates. In contrast, the United States follows a two-party system, with the dominant parties being the Democrats and Republicans.

Option 4: "The president heads the government" - This statement is true for both Mexico and the United States. In both countries, the president is the head of the executive branch and holds significant power and authority.

Therefore, the correct answer is that Mexico’s political structure differs from that of the United States because there exists a multi-party electoral system.