Do you have to go through immigration coming the U.S from Puerto Rico?

Yes, all travelers, including U.S. citizens and lawful permanent residents, are required to go through immigration processes when entering the United States from Puerto Rico. Puerto Rico is a U.S. territory, but it has its own immigration and customs regulations. Upon arrival, you will need to present your valid travel documents, such as a passport or a U.S. state-issued photo ID, to an immigration officer. The immigration officer may also ask questions about your purpose of visit, length of stay, and place of residence. If you are a non-U.S. citizen or lawful permanent resident, you may also be required to present additional documents, such as a visa or an ESTA (Electronic System for Travel Authorization).