<P> Belarus, on the other hand, pegged its currency, the Belarusian ruble, to a basket of foreign currencies (U.S. dollar, euro and Russian ruble) in 2009 . In 2011 this led to a currency crisis when the government became unable to honor its promise to convert Belarusian rubles to foreign currencies at a fixed exchange rate . BYR exchange rates dropped by two thirds, all import prices rose and living standards fell . </P> <P> In some countries, such as Costa Rica and Honduras, the U.S. dollar is commonly accepted, although not officially regarded as legal tender . In Mexico's northern border area and major tourist zones, it is accepted as if it were a second legal currency . Many Canadian merchants close to the border, as well as large stores in big cities and major tourist hotspots in Peru also accept U.S. dollars, though usually at a value that favours the merchant . In Cambodia, U.S. notes circulate freely and are preferred over the Cambodian riel for large purchases, with the riel used for change to break 1 USD . After the U.S. liberation of Afghanistan, U.S. dollars are accepted as if it were legal tender . Prices of most big ticket items such as houses and cars are set in U.S. dollars . </P> <Table> Euro per U.S. dollar 1999--2015 <Tr> <Th> Year </Th> <Th> </Th> <Th_colspan="2"> Highest ↑ </Th> <Th> </Th> <Th_colspan="2"> Lowest ↓ </Th> </Tr> <Tr> <Th> Date </Th> <Th> Rate </Th> <Th> Date </Th> <Th> Rate </Th> </Tr> <Tr> <Th> 1999 </Th> <Td> 03 Dec </Td> <Td> € 0.9985 </Td> <Td> 05 Jan </Td> <Td> € 0.8482 </Td> </Tr> <Tr> <Th> 2000 </Th> <Td> 26 Oct </Td> <Td> € 1.2118 </Td> <Td> 06 Jan </Td> <Td> € 0.9626 </Td> </Tr> <Tr> <Th> </Th> <Td> 06 Jul </Td> <Td> € 1.1927 </Td> <Td> 05 Jan </Td> <Td> € 1.0477 </Td> </Tr> <Tr> <Th> 2002 </Th> <Td> 28 Jan </Td> <Td> € 1.1658 </Td> <Td> 31 Dec </Td> <Td> € 0.9536 </Td> </Tr> <Tr> <Th> 2003 </Th> <Td> 08 Jan </Td> <Td> € 0.9637 </Td> <Td> 31 Dec </Td> <Td> € 0.7918 </Td> </Tr> <Tr> <Th> </Th> <Td> 14 May </Td> <Td> € 0.8473 </Td> <Td> 28 Dec </Td> <Td> € 0.7335 </Td> </Tr> <Tr> <Th> 2005 </Th> <Td> 15 Nov </Td> <Td> € 0.8571 </Td> <Td> 03 Jan </Td> <Td> € 0.7404 </Td> </Tr> <Tr> <Th> 2006 </Th> <Td> 02 Jan </Td> <Td> € 0.8456 </Td> <Td> 05 Dec </Td> <Td> € 0.7501 </Td> </Tr> <Tr> <Th> 2007 </Th> <Td> 12 Jan </Td> <Td> € 0.7756 </Td> <Td> 27 Nov </Td> <Td> € 0.6723 </Td> </Tr> <Tr> <Th> 2008 </Th> <Td> 27 Oct </Td> <Td> € 0.8026 </Td> <Td> 15 Jul </Td> <Td> € 0.6254 </Td> </Tr> <Tr> <Th> 2009 </Th> <Td> 04 Mar </Td> <Td> € 0.7965 </Td> <Td> 03 Dec </Td> <Td> € 0.6614 </Td> </Tr> <Tr> <Th> </Th> <Td> 08 Jun </Td> <Td> € 0.8374 </Td> <Td> 13 Jan </Td> <Td> € 0.6867 </Td> </Tr> <Tr> <Th> 2011 </Th> <Td> 10 Jan </Td> <Td> € 0.7750 </Td> <Td> 29 Apr </Td> <Td> € 0.6737 </Td> </Tr> <Tr> <Th> 2012 </Th> <Td> 24 Jul </Td> <Td> € 0.8272 </Td> <Td> 28 Feb </Td> <Td> € 0.7433 </Td> </Tr> <Tr> <Th> 2013 </Th> <Td> 27 Mar </Td> <Td> € 0.7832 </Td> <Td> 27 Dec </Td> <Td> € 0.7239 </Td> </Tr> <Tr> <Th> 2014 </Th> <Td> 31 Dec </Td> <Td> € 0.8237 </Td> <Td> 8 May </Td> <Td> € 0.7167 </Td> </Tr> <Tr> <Th> 2015 </Th> <Td> 13 Apr </Td> <Td> € 0.9477 </Td> <Td> 2 Jan </Td> <Td> € 0.8304 </Td> </Tr> <Tr> <Td_colspan="7"> </Td> </Tr> <Tr> <Td_colspan="7"> Source: Euro exchange rates in USD, ECB </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th> </Th> <Th_colspan="2"> Highest ↑ </Th> <Th> </Th> <Th_colspan="2"> Lowest ↓ </Th> </Tr>

Which is not a reason so much u.s. currency circulates in other countries