Overall transformation : Ar-H to Ar-R
Named after Friedel and Crafts who discovered the reaction in 1877.
Reagent : normally the alkyl halide (e.g. R-Br or R-Cl) with aluminum trichloride, AlCl3, a Lewis acid catalyst.
The AlCl3 enhances the electrophilicity of the alkyl halide by complexing with the halide.
Electrophilic species : the carbocation (i.e. R +) formed by the "removal" of the halide by the Lewis acid catalyst
The reactive electrophile, the carbocation is prone to rearrangement to a more stable carbocation which will then undergo the alkylation reaction.

Friedel-Crafts reactions are limited to arenes as or more reactive than mono-halobenzenes
Other Lewis acids such as BF3, FeCl3 or ZnCl2 can also be used
Other sources of carbocations can also be used:
from loss of water from alcohols treated with acid such as H2SO4
from the protonation of alkenes by acid such as H2SO4
Alkylation products can also be obtained by the reduction of Friedel-Crafts acylation products
I believe they become dead.
Answer:
Spanish settlers brought their own culture to the colonies by introducing their language, laws, religion and learning
After having relative prosperity during the second half of the 20th century until the fall of the Soviet Union in 1991. Citizens from Russia experimented relative economic hardship during the rest of the 90s. The government led by Boris Yeltsin was not successful in the transition of the economic model from socialism to open market capitalism.
Then came Vladimir Putin at the beginning of the 21st century. Under his regime, the Russian economy experimented a sustained growth due to the rising prices of oil. Industries like production, construction, real estate, and financial services all grew.
As a consequence of the improvement of the economy, the middle class grew as well as their income. GDP per capita (the amount of money the average Russian gains over a year) sharply rose since the beginning of Putin's regime and is barely reaching $12000 in 2017.
However, the country still fails to score positively in regarding corruption levels and freedom of speech. As the government is constantly accused of suppressing political opposition.
This leads to describing the standard of living of the average Russian citizen as constantly improving in economic terms, but still lacking the guarantee of security and freedom of speech.
