The Fourteenth Amendment's equal protection clause was enacted to ensure that all people have the same right within the law regardless of where they came from or the color of their skin.
This later on lead to the principle, that Even Government officials will have to be subjected to law just as ordinary citizen do. Which lead to the creation of check and balance system
hope this helps
European Emigration to the U.S. 1851 - 1860
Although the Irish potato blight receded in 1850, the effects of the famine continued to spur Irish emigration into the 20th century. Still facing poverty and disease, the Irish set out for America where they reunited with relatives who had fled at the height of the famine.
The Germans wanted the British government to ignore the Treaty of London and let the German army pass through Belgium. ... In the end, Britain refused to ignore the events of 4 August 1914, when Germany attacked France through Belgium. Within hours, Britain declared war on Germany.