The feudal system was important to the development of constitutional government because it did what

Feudalism actually lead to the creation of the constitutional government because the feudal government introduced the concepts of contracts and agreements as well as rights and responsibilities under the law, which is a fundamental concept in constitutional government. 

The first one is russia because in russia they were on the rough times and they never had a way to get out of

Because he proposed that all the treaties should be made through the league of nations.