There are an infinite number of reasons why a state like Maryland would want to join the union. They may wish to receive the same benefits for example.
by paying people to join your group
Many people join gangs to obtain protection from other gangs or to have a community network. Other reasons to join a gang are community affinity, sense of self in the community, networking, and being a part of a group.
Lgbt is not something you can join. It is a label for a group of people. Lesbian, gay, bi-sexual, and trans gender. You can join a group that supports or is made up of these people but it would be that group, not the type of people unless you fit into one of the groups.
People join interest groups because they are strongly motivated by the group's goals or, perhaps, they believe they can exercise power within the group that they would not otherwise have. Groups also entice people to join them by offering group benefits or even by punishing those who do not join.
A youtube group is a group where you can invite people to join it and upload videos and create topics that people in your group can answer.
club,they join a club
You don't !!! If others want to join the group they click on the group and then click on JOIN GROUP .. then he joins it with the permission of the owner of the group !!! :D
One of the reasons as to why people join a team is to make significant contribution while developing their skills further. Many people will tend to join teams that tends to be successful.
I believe that would be an interest group.
A club.
CLUB