In his first weeks back in office, President Trump has enacted — and walked back — tariffs that experts say would have made homebuilding more expensive in Arizona. Why it matters: The National Association of Home Builders (NAHB) warned that Trump's 25% tariffs on Mexico and Canada would directly increase the cost of building materials — and that those costs would be passed on to buyers.

When Donald Trump started the biggest trade war since the 1930s in his first term, his impulsive combination of threats and import taxes on U.S. trading partners created chaos, generated drama -- and drew criticism from mainstream economists who favor free trade.