Its people were thus reduced to slavery.是什么意思？

Its people were thus reduced to slavery.

就这样它的人民都沦为奴隶了。

its

pron. (it的所有格形式)它的，厥；

例句
The government is to accelerate its privatisation programme.
政府将加快其私有化计划的进程。

people

n. 人，人类，居民，人民，种族；vt. 居住于，布满，使住满人，在…殖民，把动物放养在；

例句
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
多数人不难理解为什么凡·高的作品是天才之作。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

thus

adv. 于是，因此，如此，这样，像这样，例如，到这程度，到这地步，这么，如下；conj. 因此；

例句
Neither of them thought of turning on the lunch-time news. Thus Caroline didn't hear of John's death until Peter telephoned...
两个人谁也没有想到打开电视看午间新闻，所以直到彼得打来电话，卡罗琳才得知约翰的死讯。

reduced

adj. 减少的，简化的；v. 换算( reduce的过去式和过去分词 )，约束，使变为，使变弱；

例句
Those booking a block of seats get them at reduced rates.
团体订座可享受折扣价。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

slavery

n. 奴隶身份，奴隶制度，苦役，奴隶般的劳动，奴役，束缚，屈从，耽迷（酒色等）；

例句
...the abolition of slavery in Brazil and the Caribbean.
巴西及加勒比地区奴隶制的废除