What has not changed is the degree of polarization around migration. Many countries with high levels of migration remain ambivalent about the effects of emigration on their societies. The value of remittances does not clearly outweigh the strain on separated families and the loss of human talent. Migrants continue to have mixed feelings about life in the United States. “We were afraid of poverty,” recalled one family of Bosnian refugees in the 1990s. “We thought we wouldn’t be able to step out on the street because of drugs, murders and similar things. We were afraid that there was no health insurance similar to what we had.”

They came anyway, since “everything looked better than going back to Bosnia with no future at all.”

Americans, meanwhile, are almost perfectly divided about whether immigration makes the United States better or worse, according to the Pew study. Given the overwhelming percentage of Americans descended from immigrants, these attitudes betray deep historical amnesia. We too easily forget the suffering of previous generations of migrants, or imagine that it was redeemed by the relative comfort of their children or grandchildren.

And when these attitudes are combined with xenophobia, punitive migration laws, harsh working conditions and a lack of social support, they raise the same question posed by migrants a century ago. Will my dreams be realized or shattered in America? For most people, the answer will lie somewhere in between.