Two teenage brothers from the Republic of Congo were living their version of the American dream. They were leaders on their high school basketball team and involved in their local church. The elder was weeks away from graduating. That dream was thrown into upheaval this month when the brothers were detained by Immigration and Customs Enforcement agents who had waited outside their guardians’ home in Diamondhead, Miss. Israel Makoka, 18, and Max Makoka, 15, were leaving to take the bus to school when they were arrested and later moved to separate facilities, in Louisiana and Texas, where they remained Wednesday. Their detention has crushed the school community in their conservative small town. “I’m heartbroken over what’s taking place,” said Stacy Campbell, a history teacher at the brothers’ school, Hancock High in Kiln, Miss., who knows the Makokas. “They definitely do not deserve this. Some of the students are just starting to talk about it, and they are very worried.…