Public transportation, funded by tax payers, can be used to transport parochial students. It is an early application of the establishment clause on state and local level.
A citizen is a legal resident of the United States. Citizen responsibilities are obeying the law (such as: serving jury duty and paying taxes).
Leonardo da' Vinci moved to the court of the French King and helped Italians <span>spread both products and ideas to other places.</span>