The Jewish view on America

Barak Obama has come under fire for comments made by his pastor of 20 years. So I thought, what is the Orthodox Jewish view expoused by rabbis about America.
Orthodox Jewish rabbis have spoken positively about American kindness but have warned their followers to be wary of American materialism.
It was Jeremiah who first exhorted Jews to pray for the country in which they reside during their exile. America has given Jews freedoms that they have not experienced since the Golden Age of Spanish Jewry during the 12th century. In reality, we have way more freedom and oppurtunity now than they had then.
It was Rabbi Moses Feinstein, the foremost acknowledged posek (decider of Jewish law) of American Orthodox Jewry during the 20th century who described the US a medinah shel chesed, a country of kindness, because of the way Jews have been treated in America. America has been a haven for the survivors of Hollocaust, a financial supportor of yeshivos (together with other institutions) and a supporter of the State of Israel and an advocate for the rights of Soviet Jews during the Cold War. The Jewish American experience has been much more positive than the African American experience and that is refflected in the different attitudes of the respective communities. Thousands of blacks were lynched. Only one person lynched was Jewish.
On the other hand, some members of the Mir Yeshiva saw American materialism as contradictory to an intensly religious life that focused on the spiritual over the material. Two rabbis come to mind. Rabbi Chatzkal Levenstein, mashgiach of Mir after the war spend three years in America. He moved to Israel to avoid what he saw as the excesive luxuries America afforded. Reb Shmuel Berenbaum, too, used to speed about the need for a person to devote himself to Torah study even though this meant forfeiting the materialism one could attain in America. Both Rabbis Levenstein and Berenbaum heralded from a past in Europe where they were used to living on a much lower standard of life and felt American materialism presented spiritual danger. But neither of them "hated" America politicaly. In fact, Rabbi Berenbaum was from the first rabbis in his community to hang a flag in his window during the Gulf War.