Former President George W. Bush ambled back into the spotlight Tuesday to laud legal immigration, a decade after he helped inflate the real-estate bubble to its 2007 peak while trying to boost homeownership among Hispanics. “America is a nation of immigrants. … Immigrants can help build a dynamic tomorrow. … They invigorate our soul,” Bush said at the keynote speech of a one-day symposium on immigration’s role in the economy at the Dallas-based George W. Bush Institute. “Growing up in Texas we have had the honor and privilege of meeting many of the newly arrived,” the former president said. “They...