CONWAY — Former President Donald Trump told thousands who gathered to see him Saturday that America has declined under President Joe Biden, but with their help, he could turn things around. “We are a nation that is no longer admired, respected or listened to on the world stage,” he said over swelling music near the end of his hour-and-a half speech at Coastal Carolina University. “We are a nation who is collapsing into a cesspool of ruin,” he said before promising to, yes, make America great again. The rally near Myrtle Beach was Trump’s first visit to the Palmetto State since he walked onto t…