Fundamentally, momentum conservation is linked to invariance under space translations. See Noether's theorem. If you want to find a system that does not conserve momentum you should look for situations where space is not uniform, e.g. balls rolling on the surface of a bowl, a planetary system (when the dynamics of the sun is neglected), etc.
Socorro is a city in Socorro County in the U.S. state of New Mexico. It is in the Rio Grande Valley at an elevation of 4,579 feet (1,396 m). In 2012 the population was 8,906.
Unmarried population in New Mexico under 18 years old in homes ; Total Population: 515,849; Unmarried partner of home lead present: 60,975; In family homes: 59,107; Population of male led and male partner homes: 1,305; Population of male led and female partner households: 28,212; Population of female led and female partner households: 2,633