The National Geographic findings on the sinking of the Maine were mostly based on the testimony of divers.
advanced computer modeling.
new eyewitness reports.
a review of old evidence

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.

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answer; generalizability;