It was the Tea Act of 1773.

It gave the British East India Company a monopoly to sell tea in the Americas.

The British East India Company was a private company that actually governed India and had loads of surplus tea that it couldn’t sell.

The Act actually crashed the price of tea in the American colonies. There were no extra taxes, just a lot of extra tea.

The Boston protest was the fact that this was introduced without consulting anyone in the Americas.