Where is the United States in Bible Prophecy?

One of the most common questions regarding Bible prophecy is where is the United States in scripture? Many nations of the world are not mentioned in scripture, however it is hard to understand how the world's most powerful nation would not be. At least not in a way that we recognize it clearly.
Their are many theories and ideas as to why this is but here are three of the most common:
The United States is no longer relevant
The United States is destroyed
The United States is no longer its own country - but part of a larger union of nations - possibly controlled by the Antichrist.
All of these responses are based on speculation. We simply do not know the answer but it is very possible there may be some symbolism that the United States may fit into. We must simply watch and wait to see what God's plan for America is.
To that effect we monitor what impact terrorism and war might have on the United States as well any other factors that could contribute to its decline or change on the world stage.
America is also Israel's closest ally. God promises to bless those who bless Israel and curse those who curse Israel (Genesis 12:3). America's relationship with Israel will be closely watched.