What significance does october 1, 1949, have in chinese history?

the boxer rebellion was defeated by foreign troops
the last dynasty ended with the death of its empress
mao zeding declared china the peoples republic of china
china ended its self-imposed isolation

the lachish letters were written by hoshaiah, a military officer stationed possibly in mareshah,   and sent to yaush, possibly the commanding officer at lachish.

the series of letters were written in carbon ink in ancient hebrew on clay ostraca, shortly before lachish fell to the babylonian army of king nebuchadnezzar in 588/6 bc during the reign of zedekiah, king of judah.