within后面的it指代的是什么

3 within后面的it指代的是什么

Tewes（1998） studies the conflict in Germany between expanding the European Union to include more members and pursuing deeper integration within it resulted from the unification of Western Germany and Eastern Germany for the unification brought about different expectations for Germany's roles from Central and Eastern European states.

想向老师们请教：

1. within后面的it指代的具体内容是什么？

2. in Germany修饰conflict还是studies？

3. 以 between开头的介词短语和resulted开头的过去分词短语都是修饰conflict吗？