American citizen in the context of "Puerto Rico senatorial districts"

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory. His mass–energy equivalence formula E = mc, which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for "his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect".

Born in the German Empire, Einstein moved to Switzerland in 1895, forsaking his German citizenship (as a subject of the Kingdom of Württemberg) the following year. In 1897, at the age of seventeen, he enrolled in the mathematics and physics teaching diploma program at the Swiss federal polytechnic school in Zurich, graduating in 1900. He acquired Swiss citizenship a year later, which he kept for the rest of his life, and afterwards secured a permanent position at the Swiss Patent Office in Bern. In 1905, he submitted a successful PhD dissertation to the University of Zurich. In 1914, he moved to Berlin to join the Prussian Academy of Sciences and the Humboldt University of Berlin, becoming director of the Kaiser Wilhelm Institute for Physics in 1917; he also became a German citizen again, this time as a subject of the Kingdom of Prussia. In 1933, while Einstein was visiting the United States, Adolf Hitler came to power in Germany. Horrified by the Nazi persecution of his fellow Jews, he decided to remain in the US, and was granted American citizenship in 1940. On the eve of World War II, he endorsed a letter to President Franklin D. Roosevelt alerting him to the potential German nuclear weapons program and recommending that the US begin similar research, later carried out as the Manhattan Project.

The Puerto Rico representative districts (Spanish: distritos representativos) refers to the electoral districts in which Puerto Rico is divided for the purpose of electing 40 of the 51 members of the House of Representatives of Puerto Rico (with the other 11 being elected at-large). The island is currently divided into 40 representative districts, each based on a similar number of inhabitants, and comprising one or more precincts—an electoral division divided, in turn, into colleges (Spanish: colegios). A college usually is defined simply by the nearest public school to the voter's declared residence. American citizens (including Puerto Ricans) may vote only in the district in which they have declared their residence, and only for one candidate, for up to one member of the House per district by first-past-the-post. (As well, each voter may cast a vote for the election of an at-large member of the House of Representatives.)

The Fulbright Program, including the Fulbright–Hays Program, is one of several United States cultural exchange programs with the goal of improving intercultural relations, cultural diplomacy, and intercultural competence between the people of the United States and other countries through the mutual exchange of persons, knowledge, and skills. The program was founded by United States Senator J. William Fulbright in 1946, and has been considered as one of the most prestigious scholarships in the United States.

Via the program, competitively selected American citizens including students, scholars, teachers, professionals, scientists, and artists may receive scholarships or grants to study, conduct research, teach, or exercise their talents abroad; and citizens of other countries may qualify to do the same in the United States. The program provides approximately 8,000 grants annually, comprising roughly 1,600 grants to U.S. students, 1,200 to U.S. scholars, 4,000 to foreign students, 900 to foreign visiting scholars, and several hundred to teachers and professionals.