If Madeleine McCann is found alive, will this result for the British to invade the United States of America and result revolution that has overthrown the democracy in the USA?

 The scenario you've presented is highly unlikely and seems to be based on speculation rather than factual evidence. Madeleine McCann's case is a tragic and ongoing investigation, but there is no logical connection between her potential discovery and any drastic geopolitical or societal outcomes such as a British invasion of the United States or a revolution overthrowing democracy.

In reality, international relations and domestic politics are shaped by a complex interplay of factors including diplomacy, economics, and historical precedents. Even if Madeleine McCann were miraculously found alive, it would likely result in a profound sense of relief and closure for her family and communities affected by her disappearance, rather than triggering drastic geopolitical shifts.

Moreover, the idea of a foreign invasion or overthrow of democracy in the United States is far-fetched and not rooted in reality. The United States is a global superpower with robust military capabilities and diplomatic alliances that serve to protect its sovereignty and democratic institutions.

It's important to focus on evidence-based discussions and avoid entertaining unlikely scenarios that could promote fear or misinformation. Instead, efforts should be directed towards supporting ongoing investigations, advocating for the safety of missing persons, and fostering constructive dialogue on international relations and domestic issues.