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					Originally Posted by Treeslicer
					
				 IMHO, early 20th. Century doesn't ensure stylistic purity.  Didn't even the Spanish initiate some relocation of populations from one island to another before the Spanish-American War?  There was a lot more moving around, and inter-island trade during American rule. | 
	
 True. However, the displaced groups tended to retain much of their original cultural identity for some time, and it usually took a few generations for cultural mixing (such as intermarrying) to occur. 
The Philippines has a strong blade culture, and cultural preferences for blade styles particular to a specific culture are especially strong--change and mixing of styles would have been slow in the examples you describe.
 
 Ian.