Why did Cuba and the US stop being friends?

Explain one major pattern of cultural interaction between nomadic and sednetary socities in afro eurasia before 1450 ce

What spurred american trade with northern mexico?

How does cooperative federalism work in the united states? a. state and federal governments have different and overlapping responsibilities b. branches of the federal government can check one another's power. c. when amending the constitution, citizens vote directly. d. bills passing the house of representatives must also pass the senate.