Question

the colonists thought the taxes were unfair.
the colonists protested the taxes.
thats a good sentence! now make it stronger by using a joining word that helps give a reason.
the colonists thought the taxes were unfair, and the colonists protested the taxes.

Explanation:

To show the reason for protesting (since they thought taxes were unfair), we use "because" or a causal - connecting word. A better sentence is "The colonists protested the taxes because they thought the taxes were unfair." or to combine the original two sentences with a causal conjunction, we can also write "The colonists thought the taxes were unfair, so they protested the taxes." The key is to use a word that indicates the reason - result relationship. The original use of "and" just connects the two actions without showing the causal link.

Answer:

The colonists thought the taxes were unfair, so they protested the taxes. (or "The colonists protested the taxes because they thought the taxes were unfair.")