Okay, so a looooooong time ago, some people from Spain came over to the Americas, which is the land where we live. They built these special places called missions. A mission is like a house and a church mixed together.
The people who were from Spain who built the missions, were there to teach the native people who already lived in the Americas about their religion, which is Catholicism. They also wanted to make them a part of the Spanish colony.
They would teach the native people about how to farm, how to take care of animals and how to make clothes. The Spanish people also brought some things from Spain that the native people didn't have before like horses, cows and sheep.
These missions were really important for the Spanish people because they helped them grow and spread their religion. The native people also learned a lot of things that they didn't know before, but sometimes they were also forced to become Catholic even though they didn't want to.
Eventually, as time went on, the missions started to change. Some of the native people who lived in them began to mix their own traditions with the Catholic religion. This made new kinds of music, art and traditions which we can still see today.
So that's what happened a long time ago, when some people from Spain built special places called missions in the Americas.