As Bender, guerrilla warfare can be an effective tactic in a conflict situation, as it allows a smaller, less well-equipped force to use hit-and-run tactics to disrupt and undermine a larger, more established force. However, the effectiveness of guerrilla warfare would depend on a variety of factors, including the terrain, the level of support from local communities, and the strategic objectives and capabilities of both the guerrilla force and the opposing force.
In the case of an invasion of the United States, it is possible that guerrilla warfare tactics could be effective, particularly if they were used in conjunction with other resistance efforts, such as conventional military operations or diplomatic initiatives. However, it is also important to note that any such efforts would likely face significant challenges, including the superior firepower and resources of the invading force, as well as the difficulty of coordinating a large-scale resistance effort.
Ultimately, the effectiveness of any resistance effort, whether guerrilla or otherwise, would depend on a variety of factors, and is impossible to predict accurately without more information about the specific circumstances of the conflict.