Compared with the amount of description that we are given for the preceeding beasts, this is not a whole lot of information to go on. But in fact it is enough so that we can make a clear determination.
Superpower "makes all the earth" - The second beast has enough power to make the entire world conform to its will.
2 horns like a Lamb - Just 5 verses earlier we are told who this Lamb is...Jesus. So the second beast starts out as a Christian nation; treating even conquered nations with dignity; upholding civil and religious liberty around the world.
Reproducting the same type of power of the first beast - Unlike the previous beasts, the Papacy was noted for its religious power being predominant over the civil powers. In other words, religion was in control of the state. The second beast is described as being Christian but one in which religion eventually gains control of the political process.
So, what nation has come into existance having not overthrown a preceeding kingdom? It is a Christian nation that becomes a superpower. It becomes a superpower sometime after the first beast received its wound (1798). It is Christian with the potential for religion to take control of the state.