What does the fact that the major parties cooperate to discourage minor parties and yet compete vigorously against each other during elections tell you about party politics in the united states?

The United States has historically favored a 2-Party System, with the Democrats and Republicans, the 2 major parties controlling most aspects of the government and public policy. The fact that the major parties cooperate to discourage minor parties shows that one party wants control of the government to implement its policies. Despite other political parties existing in the US they rarely have more than a a very modest impact in government politics.

they died because of a disease during the first spanish colonies.