Plunging temperatures have put much of the country in a deep freeze this holiday weekend, combining with snow, freezing rain, ice or gusty winds in some places to endanger nearly 100 million people from Northern California to coastal Maine.
While some people hunkered down indoors, stocking up on food and firewood, others braved the cold to attend events for the Iowa caucuses, cheer on their favorite teams at the Chiefs-Dolphins N.F.L. playoff game or go skiing, among other activities.
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