Oh, I will.
"But if the Government, for instance, but simply insists upon holding its own forts, or retaking those forts which belong to it, or the enforcement of the laws of the United States in the collection of duties upon foreign importations, or even the withdrawl of the mails from those portions of the country where the mails themselves are habitually violated; would any or all of these things be coercion?"
Lincoln tried to hold on to federal property and tried to enforece the laws. Lincoln didn't invade South Carolina or any other southren state. He took no hostile actions against any southern state prior to the southern initiation of hostilities at Sumter. His actions were not 'coercion' or 'invasion' except, of course, to those who were out for a war in the first place.
BZZZT! Wrong. Lincoln did not stop at simply taking the forts as his quote suggested he would do. Rather, he marched armies into the southern states in hostility against their people and used those armies to coerce obedience. And that, by Lincoln's very own definition, is an invasion.
He took no hostile actions against any southern state prior to the southern initiation of hostilities at Sumter.
Yes he did. He dispatched the fleet a week before Fort Sumter to provoke a military conflict.