The major purpose of Thomas Paine to write the American crisis was to inspire the American citizens against the British rule to get the independence.
Explanation:
It was published in the period during the American Revolution. Thomas had an aim of reuniting the Americans in this protest for victory and avoid the collapse of American society.
So he wrote the pamphlet when the situation of American protest was in the verge of collapsing. It was a vital role from Thomas during the protest.