1 In 1853, Charles Loring Brace came up with an idea that was the beginning of
the concept of foster care for children in the United States. 2 At that time, thereg
were an estimated 30,000 abandoned, abused, or orphaned children on the
streets of New York City. 3 Brace believed there was a way to give these children
a chance to escape their poverty and suffering. 4 His plan was to send the
children by train to live with "good" families on farms out west. 5 To put his plan
into practice, he and a group of social reformers founded the Children's Aid
Society. 6 The concept was ambitious and, to those who favored putting the
children into institutions, controversial. 7 Nevertheless, the Orphan Train
Movement lasted from 1853 until 1929 and removed more than 150,000
homeless children from the streets of New York, placing them with farm families
across the country.
Which sentence is the main idea?
