I'm pretty sure it was the horse bc native americans no longer traveled on foot for long distances. instead, they had the ability to travel using horses which was faster and more efficient
The introduction or "Preamble" if you will.
Taxation. Shay's Rebellion happened because banks were foreclosing on farmers' homes. The farmers revolted because they couldn't make their payments <em>and </em><em />the high interest rates which was somehow caused by large post (Revolutionary) war debts. The federal government struggled to pay its debts because the Articles of Confederation didn't allow the federal gov't to <em>force</em> states to pay taxes.