Short answers, pulled from the story.
The Republic of Venice was formally dissolved on the 12th of May 1797, when the Great Council voted 512 to 20 to abolish itself. The dissolution was engineered by French general Napoleon Bonaparte, who threatened war and imposed demands the Republic could not refuse, and was ratified by the secret Treaty of Leoben between France and Austria signed on the 17th of April 1797.
Ludovico Manin was the last doge of Venice. He presided over the final session of the Great Council on the 12th of May 1797, formally abolishing the Most Serene Republic of Venice. He departed the Ducal Palace forever on the 15th of May and retired to his family's residence.
The Republic of Venice existed for approximately 1,100 years before its dissolution on the 12th of May 1797. It was the first foreign state to enter Venice since the Republic's founding when French troops arrived on the 16th of May 1797.
After the dissolution, France looted Venice extensively, then handed the city to Austria under the Treaty of Campoformio in October 1797. Austrian troops took control on the 18th of January 1798. Venice returned briefly to French control after the Treaty of Pressburg in 1805, reverted to Austria in 1815 as part of the Kingdom of Lombardy-Venetia, and was incorporated into the Kingdom of Italy in 1866.
The Veronese Easter was a popular uprising in Verona on the 17th of April 1797, the same day Napoleon signed the preliminary armistice at Leoben. The population of Verona and part of the Venetian troops stationed there rose against the French occupiers, pushing them to the defensive and confining them to the city's forts. The uprising was ultimately suppressed and Verona capitulated on the 24th of April.
France destroyed the Venetian Arsenal and navy after the Republic's fall. Of the 184 ships in the Arsenal, those already equipped were sent to Toulon and the rest were scuttled. Two thousand Arsenal workers were dismissed, the fleet's magazines were plundered, and the entire Arsenal complex was burned down, ending one of the most powerful navies in European history.