Yes that's true. As the first president he set precedents for future presidents, for example the title "Mr. President," having dinner parties, having a maximum of two terms.
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Immigration drastically increased in the United States during the period between the Civil War and the early 1900s. This immigration boom coupled with increased development and industrial output following the Civil War led to large economic growth in the United States as well.
Many people believed that the Church needed to be reformed. In the 1500s Kings such as Charles V had a sole political strategy: centralisation. However, there were people who do not agree with this. So, the reformation led to warfare because of different ideas by the ruler and his people.