But lawmakers approved a constitutional amendment to change that. Putin welcomed the move.

但立法者批准宪法修订案来改变这一情况，普京欢迎此举。

If voters approve the proposed constitutional amendment next month, he could stay in power until 2036.

如果投票人下个月批准了提出的宪法修订案，他的任期或持续到2036年。

Eventually slavery was made illegal (or against the law) when the 13th Constitutional Amendment was passed (or made into law) in 1865.

最终，当第十三条宪法修正案于1865年通过（或成为法律）时，奴隶制被定为非法（或违反法律）。