The answer is Russia (the Soviet Union).
In August 23, 1939 Nazi Germany and the Soviet Union signed the "German-Soviet Nonaggression Pact," which meant they agreed to take no military action against each other in the next 10 years.
Answer: During the 1920s, immigration trends in the United States changed in two ways. First, the numbers leveled out and then fell dramatically—fewer than 700,000 people arrived during the following decade.
Explanation:
<span>Railroads played a large role in improving travel and transportation in the US and Europe, especially in the 18th century.</span>
Answer: researching effects of pollution on plants and studying animals and their habitats
Explanation:hopes this helps
(づ ̄ 3 ̄)づ