Simple answer. We are no longer the same country demographically or culturally.
The U.S. adds one international migrant (net) every 36 seconds. Immigrants account for one in 8 U.S. residents, the highest level in more than 80 years. In 1970 it was one in 21; in 1980 it was one in 16; and in 1990 it was one in 13. In a decade, it will be one in 7, the highest it has been in our history. And by 2050, one in 5 residents of the U.S. will be foreign-born.
The nations immigrant population (legal and illegal) reached 40 million in 2010, the highest number in our history. The U.S. immigrant population has doubled since 1990, nearly tripled since 1980, and quadrupled since 1970, when it stood at 9.7 million. Of the 40 million immigrants in the country in 2010, 13.9 million arrived in 2000 or later making it the highest decade of immigration in American history, even though there was a net loss of jobs during the decade. Growth in the immigrant population has primarily been driven by high levels of legal immigration. Roughly three-fourths of immigrants in the country are here legally. With nearly 12 million immigrants, Mexico was by far the top immigrant-sending country, accounting for 29 percent of all immigrants and 29 percent of growth in the immigrant population from 2000 to 2010. The median age of immigrants in 2010 was 41.4 compared to 35.9 for natives.
87 percent of the 1.2 million legal immigrants entering annually are minorities as defined by the U.S. Government and almost all of the illegal aliens are minorities. By 2019 half of the children 18 and under in the U.S. will be classified as minorities and by 2042, half of the residents of this country will be minorities. Generally, immigrants and minorities vote predominantly for the Democrat Party. Hence, Democrats view immigration as a never-ending source of voters that will make them the permanent majority party.
Since the 1965 Immigration Act, our pro-population growth immigration policies have fueled major demographic changes in a very short period of time. In 1970, non-Hispanic whites comprised 89 percent of the population; today they are 66 percent; and by 2042, they will be 50 percent. The Democrats, under the banner of multiculturalism and diversity, have forged a political coalition that depends on individuals coalescing around racial and ethnic identities rather than the issues. The continuing and increasing flow of minority immigrants, mostly poor and uneducated, provides a natural constituency for the Democrats, which see them as their principal source of political power.
The 2012 election marked a tipping point. Although whites voted 59% to 39% for Romney, it was not enough to counterbalance the minority vote with blacks voting 93% for the Dems; Hispanics 71%, and Asians 73%. Demography is destiny.
You left out the effects of rabid feminism which diminished marriage, men and the commitment to raising children causing the breakdown of family values and the family destroying the basic cell of society. This particular form of narcissism is the most lethal.