Why did the colonists shouted no taxation without representation?

a phrase, generally attributed to James Otis about 1761, that reflected the resentment of American colonists at being taxed by a British Parliament to which they elected no representatives and became an anti-British slogan before the American Revolution; in full, “Taxation without representation is tyranny."

The answer to this question is The Compromise of 1850. First, as advocated by the South, Congress passed the Fugitive Slave Act, a law that provided federal money—or “bounties”—to slave-catchers. ... Fifth, Congress avoided a direct decision on the question of slavery in the western territories, employing the principle of popular sovereignty.