<prompt> Pedzisa mutsara unotevera: MuChina, pasinei nokusaita rutivi rwakananga  <response>: MuHondo yeOpium yeChipiri, hurumende yaBuchanan yakawana mikana yokutengeserana. Mutungamiri akavimba naWilliam Bradford Reed 18061876 Gurukota rake kuChina muna 185758. Aimbova Whig, Reed akanga anyengetedza vazhinji vekare-mutsara Whigs kutsigira Buchanan mumushandirapamwe we1856. Chibvumirano cheTientsin 1858 chakapa vamiriri veAmerica kodzero yokugara muPeking, chakaderedza mwero wemitero yezvinhu zveAmerica, uye chakavimbisa rusununguko rworudzidziso rwevatorwa muChina. Reed akagadzira mimwe midzi yeOpen Door Policy iyo yakazadzika makore 40 gare gare. 