How did the great war for the empire become a "global war," and how did britain carry out its part in the struggle?

The Great War became a global war as most of europe had colonies world wide. Britain got involved as unknown to Germany, Britain had an alliance with Belgium. This meant that if Belgium got invaded Britain would step in. So when Germany tried to attack France through Belgium, the UK had no option but to fight back.

Cherokee  removal, part of the trail of tears, refers to the  forced  relocation between 1836 and 1839 of thecherokee  nation from  their lands ingeorgia, south carolina, north carolina, tennessee, texas, and alabama to the indian territory (present day oklahoma)  in  the thenwestern united states, and the resultant deaths