What are the ten most significant events of World War I?

1. assassination of archduke franz ferdinand.

2. invasion of togoland by britain and france, ww1 begins in africa.

3. japan declares war germany, ww1 begins in asia.

4.  allies stop the german invasion of paris.

5. long stalemate on the western front.

6. allies attack turkey in the gallipoli campaign.

7. the arab revolt in ottoman empire.

8. the united states enters ww1.

9. german spring offensive.

10. the central powers surrender.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.