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.
Looking back, in the year of 1960, Mexico had a population of 38.7 million people. The population of Mexico represents 1.66 percent of the worldÂ´s total population which arguably means that one person in every 61 people on the planet is a resident of Mexico.