Who worked to bring southern Italy and the two sicillies to the rest of Italy

Camillo Benso, count di Cavour and Giuseppe Garibaldi.

Explanation: both 19th-century politicians (at that time Italy was not unified). Cavour was a prime minister of Sardinian kingdom (1852-1859 and then between 1860 and 1861), he was a monarchist politician and belong to those politicians who attempted to unify Italian territories under the rule of Savoy dynasty. He became internationally recognized politician when waging a Crimean war together with Britain and France.

       Giuseppe Garibaldi is considered a representantive figure of Italian risorgimento movement driven by nationalist sentiments of that time. In 1860 he was able to move from Genoa to Sicily, to conquer a kingdom of Two Sicilies (at that time under the rule of Bourbon dynasty) and Umbria. These territories Garibaldi handed in to Savoy dynasty (Victor Emmanuel II). After all these event Italian kingdom was proclaimed in Torino (1861). Garibaldi was born in Nizza (today French city of Nice), so he is - as well as Cavour who was born in Torino - from the extreme west of Italy.  

why was the national assembly formed by the third estate?

the estates-general had not been assembled since 1614, and its deputies drew up long lists of grievances and called for sweeping political and social reforms. the third estate, which had the most representatives, declared itself the national assembly and took an oath to force a new constitution on the king.

american troops were forced to withdraw following deadly bombings.

explanation: