I’ll be the first to acknowledge the counter arguments. There are areas where the Trump presidency is bound to slow things down. Companies will be less likely to invest in nascent sectors that rely on supportive government dollars or policy, meaning that technologies like hydrogen and biofuels may take a hit.

During his campaign, Donald J. Trump vowed to end the Ukraine war by Day 1 of his new term as president. Jeanna Smialek, the Brussels bureau chief for The New York Times, looks at how he described the war in an appearance at the World Economic Forum since taking office.