The uprising sparked by the enforcement of the Stamp Act in the American colonies was known as the Stamp Act Congress, which convened in 1765. This was the first unified colonial response to British taxation, where delegates from nine colonies gathered in New York City to discuss their grievances over the Stamp Act, which imposed a tax on printed materials. The Congress resolved that only colonial assemblies could levy taxes, promoting the concept of "no taxation without representation." The collective opposition led to a boycott of British goods and eventually contributed to the repeal of the Stamp Act in 1766.