Mastoidectomy is a surgical procedure to remove an infected portion of the bone behind the ear when medical treatment is not effective. This surgery is rarely needed today because of the widespread use of antibiotics.astoidectomy is a surgical procedure to remove an infected portion of the bone behind the ear when medical treatment is not effective. This surgery is rarely needed today because of the widespread use of antibiotics.
The Germans had little choice â few other places besides the United States allowed German immigration. Unlike the Irish, many Germans had enough money to journey to the Midwest in search of farmland and work. The largest settlements of Germans were in New York City, Baltimore, Cincinnati, St. Louis and Milwaukee.n the decade from 1845 to 1855, more than a million Germans fled to the United States to escape economic hardship. They also sought to escape the political unrest caused by riots, rebellion and eventually a revolution in 1848.
Both the number and share of Europeans among the U.S. immigrant population has fallen significantly over the past 50 years. In 1960, Europeans represented 75 percent of all immigrants in the United States; declining to 60 percent in 1970, 37 percent in 1980, and 22 percent by 1990 (see Table 1).ormerly the largest U.S. immigrant group, European-born immigrants have seen their numbers decline in the United States over the past 50 years (notwithstanding a period of growth after the collapse of the Soviet Union).