Many Native American groups and enslaved people sided with the British during the American Revolution primarily because they hoped the British would offer them more freedom after the war. The British pledged to safeguard Native American lands and rights, promising to limit westward expansion by American settlers, which was a significant concern for many Native American tribes.
Enslaved people also saw the British as potentially providing an opportunity for freedom; the British offered freedom to enslaved individuals who escaped from Patriot plantations and joined the British forces. This prospect of gaining freedom was a powerful motivator for many enslaved individuals to align with the British during the conflict.
Therefore, the most accurate statement is that they hoped the British would offer them more freedom after the war.