No, it's not extremely difficult. But even if it was, the answer is not literacy tests or becoming the arbiters of who is worthy or not worthy of voting. It is my conviction that doing so would be un-American.
Now that’s just not honest. Enforcement is extremely difficult because few prosecutors have the resources to investigate the small but numerous cases where people are voting for other people, aren’t living in the precincts, etc. - instance of voter fraud that we know exists. Prosecutorial discretion will often overlook more wholesale fraud if they are wearing the same jerseys. Milwaukee County District Attorney John Chisholm has rejected to pursue cases of vote fraud in Milwaukee, yet conducted numerous “John Doe cases where his armed police raided the homes of an aid to Scott Walker, Eric O’Keefe, the head of Wisconsin Club for Growth, and others just like the FBI raid on Roger Stone. These raids were for perceived political collusion! Ultimately most were thrown out as an Unconstitutional attack on the first amendment.
But when your city and county is run by democrats and socialists, these instances of prosecutorial overreach, or in the case of voter fraud, turning a blind eye, remain unchallenged and unpunished. Chisholm is still Milwaukee County’s DA.