How do historians know what happened in the past

Why did the other allies like great britain and france not support wilsons 14 points?

What from the columbian exchange had perhaps the biggest impact on the world?

How has urban renewal affected poorer neighborhoods in major cities? check all that apply. 1. communities have been transformed to meet the needs of the modern population. 2. old stores and factories have been renovated and used for new purposes. 3. crime rates have increased as more money has come into the neighborhoods. 4. many community businesses have gone into decline or been forced to close. 5. a number of african americans have been displaced from their homes.