Posted 22 August 2009 - 09:47 AM
I suppose you can just keep using the same photo on the different pages, making different edits on each one.
If you have Illustrator downloading a vector image of a US map might be your best bet as far as quality and editability go. If not you can probably download a decent jpeg of a map and use whatever photo editing program you have to make the changes. You'll have to save multiple versions for each page though.
I'm not an expert on Powerpoint and if there may be a better way. But, this should work. Just google to find images or go to a stock photos or a clipart site. You can probably find a free map on one.