Convention center

A convention center (American English; conference centre outside the USA) is a large building that is designed to hold a convention, where individuals and groups gather to promote and share common interests. Convention centers typically offer sufficient floor area to accommodate several thousand attendees. Very large venues, suitable for major trade shows, are sometimes known as exhibition centres. Convention centers typically have at least one auditorium and may also contain concert halls, lecture halls, meeting rooms, and conference rooms. Some large resort area hotels include a convention center.

Historic centers

19th-century exhibition halls

Arizona

Arizona (ⁱ/ɛrɪˈzoʊnə/; /ærɪˈzoʊnə/) (Navajo: Hoozdo Hahoodzo; O'odham: Alĭ ṣonak) is a state in the southwestern region of the United States. It is also part of the Western United States and of the Mountain West states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado. Arizona's border with Mexico is 389 miles (626 km) long, on the northern border of the Mexican states of Sonora and Baja California.

Arizona is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. It was previously part of the territory of Alta California in New Spain before being passed down to independent Mexico and later ceded to the United States after the Mexican–American War. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase.

Center

Center or centre may refer to:

Mathematics and science

Sports

Conference

A conference is a meeting of people who "confer" about a topic.

Chicago "L"

The Chicago "L" (short for "elevated") is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. It is operated by the Chicago Transit Authority (CTA). It is the fourth largest rapid transit system in the United States in terms of total route length (at 102.8 miles (165.4 km) long), and the third busiest rail mass transit system in the United States after the New York City Subway and Washington Metro.

Chicago's "L" provides 24-hour service on some portions of its network, being one of only four rapid transit systems in the United States (the Chicago "L", the New York City Subway, PATH, and Philadelphia's PATCO Speedline) to do so. However, Chicago and New York City are the only cities in the US to offer 24 hour subway/elevated train service throughout their respective city limits every day (PATCO does not service throughout the city limits of Philadelphia). The oldest sections of the Chicago "L" started operations in 1892, making it the third-oldest rapid transit system in the Americas, after Boston's "T" and the elevated lines in New York City.