In middle childhood,children tend to choose friends who share the same sex,race,and economic background.

Friends

People with whom one has a bond of mutual affection, typically one exclusive of sexual or family relations.

Same Sex

Refers to individuals or relationships involving persons of the same biological or gender identity, often discussed in the context of sexual orientation, rights, and legal recognition.

Race

The concept that some people are distinct from others because of physical appearance, typically skin color. Social scientists think race is a misleading idea, although race can be a powerful social construction, not based in biology.