Question

in the 1930s, germany first began to expand aggressively by
○ invading russia.
○ rebuilding the german military.
○ joining german forces with italy.
○ making a pact with china.

Explanation:

In the 1930s, Germany first began aggressive expansion by rebuilding its military in violation of the Treaty of Versailles, which restricted German military capabilities. This was a precursor to further military - related aggressive actions. Invading Russia happened later in 1941. Joining forces with Italy and making a pact with China were not the first acts of aggressive expansion.

Answer:

rebuilding the German military.