In the 1800s, european nations looked to control other countries in part to expand trade networks and establish global military bases. this policy was known as

This policy is known as COLONIZATION.
Colonization refers to the action of settling down among foreign indigenous people and establishing control over them. Politically, this action is usually carried out by powerful countries. The Europeans were able to colonize Africa, America and India.

The answer is option a. boundary line drawn by pope alexander iv in 1493.