Follow our latest Day 2 coverage of the Republican National Convention.

Thunderstorms passed over Cleveland early Monday morning, but they reappeared Monday night inside Quicken Loans Arena, where the first night of Donald J. Trump’s coronation struck a dark and foreboding tone unmatched by any convention in recent history. Our takeaways:

We’re in grave danger

The lineup of speakers presented a United States in danger, threatened from abroad and from within, a once-proud nation on the very brink of chaos and dystopia. Six of the speakers were military veterans, including Marcus Luttrell, the celebrated former Navy SEAL, who bluntly warned that “the enemy is here.” A half-dozen more were relatives of Americans murdered by foreign terrorists or illegal immigrants — threats to the nation’s safety and cohesion that often mingle in the Trump worldview. Another was the former New York Mayor Rudolph W. Giuliani, who likened the country to a circa-1980s New York in need of a strong hand. “There is no next election,” Mr. Giuliani warned. “This is it!”