The mid-west region was most common in the 19th century
Fixed rate i think are there other options
Lenient....................
It was called isolationism :D
Changes vary in rate<span>, scale, and pattern, including trends and cycles. .... Fundamental concepts that underlie </span>Population Growth<span> include: ... </span>Various factors influence birth rates<span> and </span>fertility rates,such<span> as </span>average<span> levels of ... poverty, the role of </span>economic<span>, </span>political<span>, and </span>religious<span> views, and </span>different<span> ways </span>humans<span> view the earth.</span>