Why did the American colonists oppose the Stamp Act?

They felt like it was a violation of their rights and felt like they shouldn’t be taxed without representation that’s when they coined the term “no taxation without representation”

Explanation:

The third one I believe: "They objected to the tax because it was imposed without their consent or representation."

Explanation:

"These taxes included the Stamp Act, passed in 1765, which required the use of special paper bearing an embossed tax stamp for all legal documents. ... They protested, saying that these taxes violated their rights as British citizens. The colonists started to resist by boycotting, or not buying, British goods." From historyisfun.org

the corporations allowed investment without risk of personal property, fueling the growth of new businesses.