Who prevented a complete takeover of china by any one foreign power in 1899, by proposing the "open door" policy?

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

what precedent do you see the ordinance of 1787 setting for the 1st amendment of the us constitution : )

this person under me, copied me. owo