The currency used in the united kingdom is the
euro
.
dollar.
peso.
pound.

 Precisely because the largest number of migrants fled from systems that were not democratic.

Explanation:

The largest number of migrants throughout history and even today decide to leave their home country due to poor conditions. These countries are mostly ruled by corruption, and the interests of people from the ruling structures are put at the forefront. Many countries in the Middle East are violating basic human freedoms, so many people from that part of the world are trying to reach Western Europe, and to a lesser extent, the United States. Migrants leave because of the impossibility of finding a job and the violation of basic human rights guaranteed to them in democratic systems.