How did the U. S. end up with a two-party system?

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

Describe the relations between the united states and other countries under the articles of confederation. 3-4 sentences

When was the us construction written