People in Wilder, Idaho, didn’t give much thought to the dusty horse track west of town known as La Catedral Arena, where, on Sundays in the summer and early fall, vendors sold horchata and tacos, announcers called race results in Spanish and immigrant families gathered for reasonably priced fun. But when federal agents swarmed the track on Oct. 19 — weapons drawn, a helicopter overhead, unmarked SUVs screeching in on dirt roads — they did more than crack an alleged gambling ring and increase deportation numbers. They shattered Wilder’s innocent belief that its out-of-the-way location and deep-red politics could isolate the town from the raids overtaking other parts of the country. “We rely on Hispanic labor,” said Chris Gross, a second-generation farmer who grows sweet corn seed and mint in Wilder. She added, “Nobody thought something like this could happen here.” The raid on La Catedral may not have made the national headlines that immigration sweeps in Minneapolis, Chicago and Los Angeles did, but it illustrated the depth and breadth of President Donald Trump’s effort …