Part of it was because of the Industrial Revolution and the invention of the cotton gin by Eli Whitney.
The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.
When voting for a president you need to think of what they do for your Country. As an example, will the President add good founding to your area, will the President make fair rights? You need to keep all those things in mind while voting.