In the early 1800s, how did canals make it easier for settlers and immigrants to travel westward to the ohio and mississippi river valleys?

Instead of moving in groups which was dangerous, they could move on boats and stay close to other towns.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.