Border walls and related systems and methods

A method of constructing a border wall comprising:

• manufacturing at a first location a plurality of precast concrete base members, each base member including a plurality of left generally circular openings extending downwardly from a top surface of the base member, a square opening extending downwardly from the top surface of the base member, and a plurality of right generally circular openings extending downwardly from the top surface of the base member, the square opening being positioned between the plurality of left generally circular openings and the plurality of right generally circular openings, wherein the diameter of each plurality of left generally circular openings, right generally circular openings, and the square opening have approximately the same size opening;
• manufacturing at a second location a plurality of bollard fence sections, each bollard fence section including a plurality of left bollards, a match bollard having a square shape adapted to snugly fit within the square openings, and a plurality of right bollards, the match bollard being positioned between the plurality of left bollards and the plurality of right bollards, wherein each of the plurality of left bollards, right bollards, and the match bollard have the same size square cross section;
• transporting the base members to a third location;
• transporting the bollard fence sections to the third location, the base members and the bollards on the bollard fence section not being engaged with the downwardly extending openings in the base members when the base members and the bollard fence sections are being transported;
• digging a trench at the third location, the trench having a width greater than a width of the base members and a height approximately equal to a height of the base members;
• positioning the plurality of base members in the trench in end-to-end relationship;
• positioning each bollard fence section into engaging relationship with a corresponding base member located in the trench, wherein the plurality of left bollards are located within the left generally circular openings of the base member, the match bollard is engaged with the square opening of the base member to align the bollard fence section with the base member, and the plurality of right bollards are located within the right generally circular openings in the base member, wherein the number of left openings in the base members is less than the number of right openings in the base member, and the number of left bollards corresponds to the number of left openings and the number of right bollards corresponds to the number of right openings;
• while the base members are in the trench, pouring concrete into the space within the generally circular openings and surrounding the portions of the bollards located within those openings;
• and
• allowing said concrete to set to securely attach the bollard fence sections to the base members.