PORTLAND , Oregon — To travel through the Rose City on the Saturday that Donald Trump announced he would deploy armed federal troops here, licensed to kill, was to witness a sun-drenched metropolis buzzing with the catch-it-while-you-can energy of fading summer.

Kayaks slipped into the Willamette River; sunlight glinted through mimosa glasses at outdoor cafes; teenagers squealed with fright-delight at an oak-shaded amusement park; club kids in black denim queued for a show you’re not cool enough to know about. The only sign of anything vaguely militant were the pine-green throngs of the Timbers Army — the boisterous fans of the local Major League Soccer franchise — marshalling for a match against FC Dallas, on ( shhh, don’t tell Stephen Miller ) Hispanic Heritage Night .

In a pos

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