Why is lesotho poor?

Lesotho is poor because they do not trade with many other countries. It is landlocked and its taxation is mainly gleaned from the many workers employed in the mines of surrounding South Africa. Lesotho is small, formerly drought ridden, and predominently mountainous. Most farming is subsistence farming. Things are changing, however, a new hydropower installation has meant Lesotho is around 98% self sufficient in electricity and can sell water to South Africa. The decline of mining has seen diversification into different employment and an increase in canning, leather and jute processing. And clothing/shoe assembly for export.