秦王嬴(🍅)稷(🌠)(秦昭王)当(🐽)政不(bú )久,列国(🍩)展(zhǎn )开一系列兼并(bìng )(🕸)战争(zhēng )。秦国看(🍥)准(zhǔn )时机,先与齐连横,攻略魏国(🐮)大(🥩)片土地。由此,战国(guó )进(❣)入秦(qín )齐(qí )赵三(sān )国并强阶(jiē )段(🕔)。此(cǐ )时(🎩),秦(🗄)国国(guó )内宣太后掌(zhǎng )政(✳),穰侯魏冉(rǎn )等“四贵”专权、,秦(qín )昭王王权旁落(luò )。然(rán )而外(🕕)部局势对(duì )秦国十(⏺)分有利:纵横(🔩)家苏秦与(yǔ )(🚨)燕王(⏯)秘(😞)约(yuē )赴齐,以灭秦为目标(biāo )“死间(🗞)”齐国。面对(🏂)国(guó )内政(🤸)治困(🙄)局和国外有利机遇,秦(qín )王(⛏)嬴稷毅然起用范雎,放逐魏冉等“四(🎋)贵”、(🐀)废太后之(zhī )(🤖)权而恭(🌮)养之。同时,与(💹)苏秦合谋,五国(guó )联军在(zài )燕将乐毅率领下攻破齐国都(🃏)城临淄(zī )。秦王嬴(yíng )稷遣将(🔈)白起,相继在伊阙、(🔍)郢都、华阳、长(zhǎng )平发动四(sì )大(♌)战役,歼(jiān )灭了韩(🏴)魏齐(qí )楚(chǔ )赵百(🔙)