Why did early civilizations begin in river valleys? The flooding of rivers created good farmland.
Rivers provided plenty of fresh water.
People could hide from enemies in river valleys.
River valleys had many trees for building.

Ineed with what i should write for my research paper. my topic is history of slavery. 1800 words. all i need is what to write in each paragraphs. like when the research paper has titles for each paragraph and it explains the tile in each paragraph. for example when did slaverh begin? why did it begin like an outline.

What is the purpose of the system of checks and balances

Congress could only request money and had no power to tax; each state made its own money; there was no national court system. which one of these weaknesses do you believe was the most important to correct?