Why was there a need for expansion into the Pacific Ocean?

A. Steamships needed a place to refuel.

B. Small tribes were in constant need of care.

C. Governments were fighting for control of the ocean.

D. Governor Roosevelt felt the time was right.

A--needing a place for steamships to refuel: the push came from the need for a modern navy to support the economic interests in Asia.

Alfred Mahan's book on sea power convinced the US government a modern navy was needed. To create a large fleet, the US needed ports on islands throughout the Pacific to refuel and rest ships. These parts were provided as trade deals, protection, or takeover of the land.