In the late 1970s many arterial roads were redesigned as ejes viales; high-volume one-way roads that cross, in theory, Mexico City proper from side to side. The eje vial network is based on a quasi-Cartesian grid, with the ejes themselves being called Eje 1 Poniente, Eje Central, and Eje 1 Oriente, for example, for the north-south roads, and Eje 2 Sur and Eje 3 Norte, for example, for east-west roads. Ring roads are the Circuito Interior (inner ring), Anillo Periférico; the Circuito Exterior Mexiquense ("State of Mexico outer loop") toll road skirting the northeastern and eastern edges of the metropolitan area, the Chamapa-La Venta toll road skirting the northwestern edge, and the Arco Norte completely bypassing the metropolitan area in an arc from northwest (Atlacomulco) to north (Tula, Hidalgo) to east (Puebla). A second level (where tolls are charged) of the Periférico, colloquially called the segundo piso ("second floor"), was officially opened in 2012, with sections still being completed. The Viaducto Miguel Alemán crosses the city east-west from Observatorio to the airport. In 2013 the Supervía Poniente opened, a toll road linking the new Santa Fe business district with southwestern Mexico City.
What main road leads to the airport?
The Viaducto Miguel Alemán

Devise Minority Party Strategies. The minority leader, in consultation with other party colleagues, has a range of strategic options that he or she can employ to advance minority party objectives. The options selected depend on a wide range of circumstances, such as the visibility or significance of the issue and the degree of cohesion within the majority party. For instance, a majority party riven by internal dissension, as occurred during the early 1900s when Progressive and "regular" Republicans were at loggerheads, may provide the minority leader with greater opportunities to achieve his or her priorities than if the majority party exhibited high degrees of party cohesion. Among the variable strategies available to the minority party, which can vary from bill to bill and be used in combination or at different stages of the lawmaking process, are the following:
Does minority leader always employ same strategy for party objectives?
options selected depend on a wide range of circumstances

Following the breakup of the Russian Empire in the aftermath of World War I for a brief period, from 1918 to 1920, Armenia was an independent republic. In late 1920, the communists came to power following an invasion of Armenia by the Red Army, and in 1922, Armenia became part of the Transcaucasian SFSR of the Soviet Union, later forming the Armenian Soviet Socialist Republic (1936 to September 21, 1991). In 1991, Armenia declared independence from the USSR and established the second Republic of Armenia.
Who invaded Armenia in 1920?
the Red Army