For most of the poor, the U.S. is no longer the land of opportunity. It is two or three times as difficult for children of poor families to rise above their economic circumstances as economistis reckoned in the 1970 and 1980s What does the second sentence do?

প্রশ্নঃ For most of the poor, the U.S. is no longer the land of opportunity. It is two or three times as difficult for children of poor families to rise above their economic circumstances as economistis reckoned in the 1970 and 1980s What does the second sentence do?