Why did immigrants have such a difficult time in american cities

The vietnam war was considered by many to be america’s first unopposed win independent war defeat

What made it increasingly difficult for president roosevelt to stay neutral during world war ii?

How does the principle of federalism affect the u.s. government? a. it guarantees that the united states will always be a representative democracy b. it ensures that the state governments have greater authority that the federal government c. it creates both separate and overlapping powers for the federal and state governments d.it divides the federal and state governments into three branches