にさせる usage in a sentence


I was reading the Japanese version of No Longer Human by Osamu Dazai, and this
sentence came up.

> 嫌な気持ちにさせるのだ

I would like to know why に particle was used before the word させる.




This grammar can be broken down into two parts:

First of all, `にする` is a grammar point on its own (see
<https://www.kanshudo.com/grammar/%E3%81%AB%E3%81%99%E3%82%8B> for reference),
which in this case carries the meaning of `causing a state to be so`.

The verb する is then changed to させる in its **causative** for, emphasizing the
negative nature of the 嫌な気持. (See: [Difference between にさせる vs にする（as in
幸せにさせる vs
幸せにする)](https://japanese.stackexchange.com/questions/7051/difference-
between-%e3%81%ab%e3%81%95%e3%81%9b%e3%82%8b-vs-%e3%81%ab%e3%81%99%e3%82%8b-as-
in-%e5%b9%b8%e3%81%9b%e3%81%ab%e3%81%95%e3%81%9b%e3%82%8b-vs-%e5%b9%b8%e3%81%9b%e3%81%ab%e3%81%99%e3%82%8b)
and [Difference between 人を不安にさせる and
人を不安にする](https://japanese.stackexchange.com/questions/90676/difference-
between-%E4%BA%BA%E3%82%92%E4%B8%8D%E5%AE%89%E3%81%AB%E3%81%95%E3%81%9B%E3%82%8B-and-%E4%BA%BA%E3%82%92%E4%B8%8D%E5%AE%89%E3%81%AB%E3%81%99%E3%82%8B))

