Which nationalities and countries can buy mechanium?

All nationalities can buy Mechanium. Citizens of the following countries are not allowed to buy $Mechanium for legal reasons:

Afghanistan
Angola
Azerbaijan
Bosnia and Herzegovina
Botswana
Burundi
Cambodia
Cameroon
Chad
China
Congo
Congo (Democratic Republic)
Cuba
Eritrea
Ghana
Guinea
Guinea-Bissau
Haiti
Iran
Iraq
Lao People's Democratic
Republic
Liberia
Libya
Madagascar
Mozambique
Nicaragua
North Korea
Pakistan
Somalia
South Sudan
Sri Lanka
Sudan
Syrian Arab Republic
Tajikistan
Trinidad and Tobago
Turkmenistan
Uganda
United States
Uzbekistan
Vanuatu
Venezuela
Virgin Islands (U.S.)
Yemen
Zimbabwe