60719
Then in the early 19th century , the advent of the steam engine , the search for new lands and trade routes , the expansion of the British Empire through her colonies , and other influences , all contributed to the revitalization of sea trade and a renewed interest in port works .
 British Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 British Empire