Global Alliances: the Allied Forces in WW2 (US, UK, Canada, China, etc), Axis forces in
WW2 (Germany, Japan, Italy. etc), NATO nowadays (US and most of Europe against Russia), etc
Alliances in media: The Federation of many different planets in Star Trek, the strategic groups/relationships competitors on reality shows like Survivor form, Order of the Phoenix in Harry Potter
Personal Alliances: Your friends, parents, siblings, and extended family