Tattoos started to become popular in the United States and England during the 1860s and 1870s. At first, tattoos were most often given to soldiers and sailors. The first known professional tattoo artist in the United States was Martin Hildebrandt, a German immigrant who arrived in Boston in 1846. Between 1861 and 1865, he tattooed soldiers on both sides in the American Civil War. The first known professional tattooist in Britain worked in the port of Liverpool in the 1870s, tattooing mostly sailors. However, by the 1870s, tattoos had become fashionable among some members of the upper classes, including royalty.