president who stopped slavery
Timelines help us line up when things happened, like if you were doing a timeline of your life for example, mark where things happened in order like when you were born, first word, first step, ect ect. Its just a way to put things in order.
The answer is helped. Trade was foundational to the growth of cities because it helped. Guaranteed an exchange of goods and idea made reliance on other civilization possible showed military strength gave people jobs.
Ford's mass production method on a moving line was called the moving assembly line
hope this helps
