The ban on migration to Taiwan was relaxed sometime after 1722 (and was completely removed in 1874). During the 200 years of Qing dynasty rule, thousands of immigrants from Fujian arrived yearly; the population was over one million in the middle of the 18th century. Civil unrest and armed conflicts were frequent. In addition to resistance against governments (both Chinese and later Japanese), battles between ethnic groups were also significant: the belligerents usually grouped around the language they used. History has recorded battles between Hakka speakers and Hokkien speakers; between these and the aborigines; and even between those who spoke different variants of Hokkien.