The Treaty of Guadalupe-Hidalgo was the treaty that formally concluded the Mexican War (1846–1848) between the United States and Mexico. The main agreement established was the "Mexican Cession," the region that Mexico was forced to cede to the United States. It was agreed that Mexican citizens in that area would be considered as legal U.S. citizens unless they vacated the area or filed as Mexican citizens for that first year. In practice, this meant that many people were separated from their families, and a long process of discrimination against Mexican Americans started.
The Mayflower Compact was important because it was the first document to establish self-government in the New World. It remained active until 1691 when Plymouth Colony became part of Massachusetts Bay Colony.
the literal definition is a well known for some bad quality or deed. Just think of a bad person in history. We would call that person Infamous because of his actions. This goes the same for Infamy. Hes saying that this horrible attack will live in Infamy(which means well known terrible thing) we will remember forever. Hope this helps