how? what can be done?
There are three main ways, I think bitcoin and the blockchain can help poor countries.
1. Governments can use bitcoin's blockchain as a public ledger to openly display receivables and expendables. This could help cut down on corruption and fraud.
2. Bitcoin is already revolutionizing the remittance markets, making it cheaper and quicker for foreigners to send money back to their country. These are huge sums of money and the consequent savings will have a great impact on countries in Sub-saharan Africa and the Philippines especially.
3. Bitcoin allows for cross-border lending meaning that small business owners in Kenya and other under-banked regions of the world can get access to working capital. They grow as a result and hire new staff - which benefits their local communities.