Why was a strong military necessary for an imperial power?

Apex plz i’m almost done if i get this all right

How did the life of sharecroppers affect their children? children went to school because the farms were small, with little work, children had to work on the farm, so they rarely went to school children learned skilled professions as they worked around the farm. children left home when they became adults because the land wasn't theirs.

Why did roosevelt support a “europe first” strategy even though it had been japan that had first attacked the united states?