== Edit War of a sorts,  please bring discussion here. == 

 I am attempting to clean up,  expand and clarify the section currently under "20th Century,"  however,  not only my section headings but detailed changes to text have been reverted (once or twice).  I hope that we can have a discussion here. 

 First,  this material,  as the entire article,  seems to me relatively weak. 

 "20th century" is an arbitrary category that does not particularly reflect any sort of change in Mexico nor a period in its history.  I am roughly attempting to adopt the historical periods expressed by Enrique Krauze in Biographia del Poder and elsewhere,  which are well-known ways of expressing the periods of Mexican history. 

 Are my period and section titles perfect?  No,  they're first attempts.  Feel free to correct them,  explore the underlying materials and have a discussion.  Please do not revert changes outright,  without thinking of the WikiPedia suggestions "be polite" and "assume goodwill,"  and without considering the value of coming to this page for a discussion. 

 Thanks to all reading this.