Answer:
First, interest groups, political action, Super PACs, People whose identities are not disclosed.
Explanation: are correct

A river valley civilization is an agricultural nation or civilization situated beside and drawing sustenance from a river. A "civilization" means a society with large permanent settlements featuring urban development, social satisfaction, specialization of labor, centralized organization, and written or other formal means of communication. A river gives the inhabitants a reliable source of water for drinking and agriculture. Additional benefits include fishing, fertile soil due to annual flooding, and ease of transportation. The first great civilizations, such as those in Mesopotamia and Ancient Egypt, all grew up in river valleys. Tigris River flourished near Mesopotamia civilization and river nile flourished near civilization of Egypt.
<h2>ꜰᴏʟʟᴏᴡ ᴍᴇ❤</h2>
<em>They wanted to invade Poland.</em>
Explanation:
Germany, ruled by Hitler during this time, wanted to essentially take over Europe and spread Nazism. Hitler wanted to keep expanding and he wanted to expand into Poland as well.
On August 23, 1939, Germany and the Soviet Union had signed a non-aggression pact called the German-Soviet Nonaggression Pact. This meant that they had signed an agreement not to attack each other for ten years.
Hitler signed this non-aggression pact because he wanted to be able to invade Poland without fighting the Soviet Union. He knew he would have to be fighting the forces from Great Britain and France on the west and didn't want his east to be fighting him as well.