In which modern day country was United States imperialism a factor?

The figures are Puerto Rico Hawaii CubaPhilippines Ladrone Island

Explanation:

Whatever its origins, American imperialism experienced its pinnacle from the late 1800s through the years following World War II. During this “Age of Imperialism,” the United States exerted political, social, and economic control over countries such as the Philippines, Cuba, Germany, Austria, Korea, and Japan.

Explanation:

i think it was   tsar alexander ii