What are the names of the current U.S. territories and the years they became territories? Provide a bullet point list in the format of the year, followed by a colon, followed by the territory. List the years in chronological order.
system
vartmaan america kshetron ke naam kya hai or varshon se ve kshetra ban gaye hai?varsh ke praaroop main ek bullate point suchi pradaan karen, iske baad ek brihadantra, uske baad kshetra dwaara.kalanukramik kram main varshon kii suchi banaaen.
user
america adhigrahan ke kalanukramik kram main paanch sthaayee rup se based hue kshetra hai:

• 1899: guam
• 1899: purto rico
• 1900: american samoa
• 1917: america virgin dweep samooh
• 1986: uttari maariana dweep
assistant
<|system|>
</s>
<|user|>
vartmaan america kshetron ke naam kya hai or varshon se ve kshetra ban gaye hai?varsh ke praaroop main ek bullate point suchi pradaan karen, iske baad ek brihadantra, uske baad kshetra dwaara.kalanukramik kram main varshon kii suchi banaaen.</s>
<|assistant|>
america adhigrahan ke kalanukramik kram main paanch sthaayee rup se based hue kshetra hai:

• 1899: guam
• 1899: purto rico
• 1900: american samoa
• 1917: america virgin dweep samooh
• 1986: uttari maariana dweep</s>
