Crossword puzzle of Imperialism

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Across
  1. 4. A dull black ore containing the elements niobium and tantalum
  2. 5. Basic unprocessed substances from nature (coal, wood, water)
  3. 8. Indian soldier serving in European armies
  4. 9. Institution against a person based on the color of their skin
  5. 10. Modernization era in Japan
  6. 11. The world's largest and most populous continent
  7. 12. A vibrant West African nation known for its rich history as the first sub-Saharan African country to gain independence
  8. 13. British sovereignty in India
  9. 15. A settlement established by people from a distant land
  10. 16. Refers to a person's native country or homeland
  11. 18. A versatile elastic material, sourced naturally from tropical trees
  12. 19. A sudden, illegal seizure of power, typically by a small group, often military
Down
  1. 1. A technique that takes advantage of a flaw (vulnerability) in software
  2. 2. A discredited ideology that misapplied Charles Darwin's concept to human society
  3. 3. A high-ranking official who governs a territory in the name of a monarch
  4. 6. The process of taking in and fully understanding information or ideas
  5. 7. A person sent by a religious group (often Christian) to spread their faith
  6. 11. An extensive group of states or countries under a single supreme authority
  7. 14. A conflict between the British Empire and the two independent Boer republics
  8. 17. The world's second-largest, second-most populous continent