I heard that Taiwan and Fujian were connected a long time ago, but something happened to the earth's crust again, and Taiwan and Fujian were separated.

As far as I know, Taiwan is the product of volcanic activity. Although Taiwan and the mainland are one plate, they were not separated later. In general, they were squeezed from the sea off the east of Taiwan toward the mainland. It probably happened at the same time as the address movement in some parts of the mainland. To put it simply, the roots are connected, but they blossomed separately.

Both of the ancestral homes were visited by boats in the past, after all, they are very close. Taiwan Many Hakkas and people from other provinces brought over by the Kuomintang.