Read the text and fill in the blank with the correct relative pronoun: "System InitiativesThe global, regional and industry challenges facing the world are the result of many “systems” – from global systems influence the environment and natural resource security, to the economic systems that create inequality, to the regional systems that determine the fortunes of nations, to the industry systems that determine the effectiveness of supply and demand. To enable our constituents to make sustained positive change, we work with them to understand and influence the entirety of the system that affects the challenges and opportunities they are trying to address. We do this through a series of System Initiatives, described below."

The best relative pronoun would be "that", but "which" also works.

That works for both people and things, and the world "global systems" is grammatically a thing, so "that" works for it.

Which only works for things, and emphasizes a bit more the preceding term.

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the illustration   that would give a reader a clear understanding of the text is a picture of men constructing the frame of a building.the frame is made of iron bars. the text describes the job of blacksmiths'. these were very organised and they had different names: "the driver" and "the heater". the text describes the way in which these men worked ; they worked iron pieces as if they were playing a sport. in fact, the text wants to show the men's skills. the text also puts some emphasis on the use of '' rivets'' in construction. this kind of nails were not always used in the construction of manhattan.

some examples:

"and with an underhand toss he hurled the smoking rivet straight at the catcher, who caught it in mid-air in his catching can." men's skills

"when the driver was ready for a new " the emphasis on the rivet ( special nail used in construction).

" it against a beam to remove any cinders, and jammed it into the waiting hole. " the emphasis on the rivet.