Compounds that have the same molecular formula but different chemical structures are called isomers. Remember isomerism is a property between a pair (or more) of molecules, i.e. a molecule is an isomer of another molecule. A similar relationship is that of brother or sister...
Many Americans are up in arms. But in fact, keeping out desperate souls seeking entry into America has deep roots. On this day 100 years ago, the United States passed the strictest immigration law of its time: the Immigration Act of 1917. The law restricted the immigration of undesirables, including many people from the Middle East and Asia, through increased taxes, tests and outright bans.
It was also the first law to impose restrictions on the basis of skill, a legacy that persists in current policy. The Chinese Exclusion Act of 1882 prohibited immigration of all Chinese laborers, either skilled or unskilled, providing specific exemptions for merchants, teachers, students and officials.igure 2 presents the pattern of Chinese immigration from 1882 to 1930 6. Chinese immigration dropped off dramatically after the passage of the first exclusion act in 1882 and again after the 1884 amendment, the Geary Act of 1892, the Ju Toy Supreme Court decision in 1905, and the Immigration Act of 1924.