In which two nations or regions of the world did european primarliy establish colonies during the new imperialism.

Africa and Mexico.

Explanation:

This is most likely late, but they became the targets because Africa was known for their metal reserves while mexico was known for their Oil and crops

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

it's not the readmission