After the end of hostilities, a period of growth and expansion started for the city. In 1853 a stagecoach bus line was established joining Montevideo with the newly formed settlement of Unión and the first natural gas street lights were inaugurated.[citation needed] From 1854 to 1861 the first public sanitation facilities were constructed. In 1856 the Teatro Solís was inaugurated, 15 years after the beginning of its construction. By Decree, on December 1861 the areas of Aguada and Cordón were incorporated to the growing Ciudad Nueva (New City). In 1866, an underwater telegraph line connected the city with Buenos Aires. The statue of Peace, La Paz, was erected on a column in Plaza Cagancha and the building of the Postal Service as well as the bridge of Paso Molino were inaugurated in 1867.
What year was the Teatro Solis inaugurated?  (If the question is unanswerable, say "unanswerable")
1856