Final answer:
Vatican City was created in 1929 by the Lateran Treaty, and Paris was the city rebuilt by Baron Haussmann in the second half of the nineteenth century.
Step-by-step explanation:
The city that was created in 1929 by the Lateran Treaty is Vatican City. The Lateran Treaty was an agreement between the Kingdom of Italy and the Holy See that established Vatican City as a sovereign and independent city-state, providing the Catholic Church with a non-territorial spiritual sovereignty and the Pope with secular power over the area. Vatican City became the smallest independent state in the world, both in area and population.
In relation to the provided reference question, the city that was rebuilt by Baron Haussmann in the second half of the nineteenth century is Paris. Georges-Eugène Haussmann, known as Baron Haussmann, was appointed by Emperor Napoleon III to modernize Paris. His extensive renovation included the construction of wide avenues, beautiful parks, and monumental squares, which substantially altered the urban fabric of the city and established its modern appearance.