Poland utilizes tight security at their border including fencing, barbed wire, armed guard patrols, and surveillance cameras. A key element of this successful strategy is the deterrent of lethal force: Would-be invaders are shot if they attempt to invade.
America ought to be no different. If a person does not attempt to enter the nation through legal channels at specified locations in the border, and instead attempts to enter the border via other means, they should expect to be treated as a hostile invader.
While this policy may sound as though it would create a lot of death, it would ultimately save many, many lives in the long run as the third world will simply stop pouring in once they are made aware that the United States’ border enforcement will kill to perform their duty. As a consequence, the violent crimes committed and inflated by illegal aliens will drop.