How does John Adams think that the colonists can form a unified opinion on the question of
declaring independence from Britain?

They were outraged by the taxes, however, they thought that a war with such a powerful nation would mean nothing and would never win. Some think we should pay our taxes because we have to be honest in Britain

Explanation: These opinions by the others will unite a declaration to stand against them.

its many islands, high mountains, and remote peninsulas isolated population centers.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.